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Checking if a SQL Server login already exists
I need to check if a specific login already exists on the SQL Server, and if it doesn't, then I need to add it.
10 Answers
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MongoDB drop every database
I would like to know if there're a command to drop every databases from my MongoDB?
8 Answers
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How to call a parent method from child class in javascript?
I've spent the last couple of hours trying to find a solution to my problem but it seems to be hopeless.
8 Answers
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Command-line Tool to find Java Heap Size and Memory Used (Linux)?
... what most tools use, all you can do is use
jps -lvm
and infer that the settings will be from the command line options.
You can't get dynamic information without JMX by default but you could write your own service to do this.
BTW: I prefer to use VisualVM rather than JConsole.
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Can scripts be inserted with innerHTML?
I tried to load some scripts into a page using innerHTML on a <div> . It appears that the script loads into the DOM, but it is never executed (at least in Firefox and Chrome). Is there a way to have scripts execute when inserting them with innerHTML ?
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When should one use a spinlock instead of mutex?
I think both are doing the same job,how do you decide which one to use for synchronization?
6 Answers
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Difference between malloc and calloc?
...system with virtual memory.)
Some compilers even can optimize malloc + memset(0) into calloc for you, but you should use calloc explicitly if you want the memory to read as 0.
If you aren't going to ever read memory before writing it, use malloc so it can (potentially) give you dirty memory from i...
C++ preprocessor __VA_ARGS__ number of arguments
Simple question for which I could not find answer on the net. In variadic argument macros, how to find the number of arguments? I am okay with boost preprocessor, if it has the solution.
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Why do I get “a label can only be part of a statement and a declaration is not a statement” if I hav
I have the following simplified code:
2 Answers
2
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stl 字符串std::string作为std::map主键key的实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
stl 字符串std::string作为std::map主键key的实例本文通过一个实例介绍std::map字符串作为key的常见用法，并使用find_if实现map按value值查找。代码如下：
#include <map>
#include <string>
#include <algorithm>
using namespace std;
class map_value_finder
{...